ISDN using external Modem

Unanswered Question
Jan 12th, 2008
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I am setting up a remote site to use ISDN as back up link. The primary link will be MPLS, when it goes down the router will connect to the the hub using ISDN.

I have a 1841 router with a 2 port sync/async interface which will connect to an external modem using smart-serial to VTE cable. (5,6 - Blackbox ISU-128 ISDN Modems). The SPIDS will be configured on this external modem.

Mentioned below is the configuration I have come up with. Is there anything else that I need to configure? This is for the remote site but I hope I can just replicate this on the hub as well.

interface Serial1/0

ip address

encapsulation ppp

no ip mroute-cache

dialer in-band

dialer idle-timeout 6000

dialer map ip name Edenton broadcast

dialer-group 1

pulse-time 1

no cdp enable

ppp authentication chap

access-list 190 deny ip any host

access-list 190 deny eigrp any any

access-list 190 deny tcp any eq 179 any eq 179 --> deny bgp

access-list 190 deny udp any any eq snmp

access-list 190 deny udp any any eq snmptrap

access-list 190 permit ip any any

dialer-list 1 protocol ip list 190

ip route 254 --> floating static

ip route 254 --> floating static

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